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Geologic Unit: Chana
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Map showing publication footprint
  • Usage in publication:
    • Chana member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Dolomite
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Templeton, J.S., and Willman, H.B., 1952, Guidebook for the 16th annual field conference, central northern Illinois: Tri-State Annual Field Conference Guidebook, October 11-12, 1952, no. 16, 47 p., Also issued as Illinois State Geol. Survey Gdbk., 2nd ser., 1952. http://archive.org/details/guidebookforsixt02tris


Summary:

Figs. 3, 12. Chana Member of Pecatonica Formation. Dolomite, nonargillaceous, sandy, thick-bedded. Thickness about 6 feet. Shown on columnar section as underlying Dane member (new) and overlying Hennepin member (new). Age is Middle Ordovician.
[Notable exposures in Dixon-Oregon area, northern IL.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 715).


Map showing publication footprint
  • Usage in publication:
    • Chana Member
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Willman, H.B., Atherton, Elwood, Buschbach, T.C., Collinson, Charles, Frye, J.C., Hopkins, M.E., Lineback, J.A., and Simon, J.A., 1975, Handbook of Illinois stratigraphy: Illinois Geological Survey Bulletin, no. 95, 261 p.


Summary:

Member is 6.2 ft thick at type section. In northern outcrop area, is commonly less than 5 ft thick, but reaches 20 ft in southern IL. In northern area, consists largely of brown, thick-bedded, vuggy, pure dolomite containing disseminated sand grains and, in places, thin beds of sandstone of the St. Peter texture. Basal part commonly has slightly argillaceous or shaly beds and phosphatic pebbles. In southern IL, unit is largely pure, thick-bedded limestone.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).